Gas burner



July 2, 1946 T. H. 'rl-HELE 2,403,139

GAS BURNER Filed Jan. 26,` 1942 ATTDENLY.

Patented July 2, 1/946 oFF1cE GAS BURNER Y Theodore H. Thiele, Milwaukee, Wis., assignor to i A. 0. Smith Corporation, corporation oi' New York' Milwaukee, Wis., a

' Application January 2o, 1942, ser1a1N0-42a24s 2. Claims. 1

This invention relates to a gas burner for operation with butane and other similar hydrocarto/be employed in such burner. I

One object of the present invention is to provide a gas burner with an improved venturi that effectively mixes the gas and air in their passage from the inlet end of the venturi to the burner ring. j

Another object is to provide a gas burner with an improvedventuri that' is economical to construct. y

A further object is to provide a gas burner in which the mixed gas and air is equally .distributed throughout the internal channel of the burner.

Other objects will become apparent from the following description. and accompanyingy drawing y illustrating an embodiment of the invention.

"of Fig. 1;

Fig. 3 is a section takenv on line 3-3 of Fig. 1;

Fig. 4is a section taken on line 4--4 of Fig. 1, and 1 Fig. 5is a section taken on line '5-5 of Fig. 1.

Referring to the drawing, there is illustrated an, embodiment of the invention comprising' a tubular ring member I with an internal channel I2, cast integrally with the venturi 3 having an internal passage 4 connecting with the channel 2.

It is preferred that the ring member I have a substantially continuous slot 5 in its upper surface for constituting the flame propagatingiet. The dead ends 8 adjoin the venturi 3, and provide a Idepression in the upper surface of the burner `bon fuels, and more particularly to the venturi 2 the air required to providetne gas and air mixture desired.

The constricted throat portion is provided'l" in the venturi 3 at a position between that of the inlet end 'I and the neck portion 9. 'I'he throat-8 is preferably round and has only a slight longitudinal extent. The neck 9 'is disposed betweenthe throat 8 and the outlet end I0. In contrast to the throat portion 8, .the neck 9 of the venturi 3 has a noncircular shape and gradually increases in crosssectional area fromthethroat 8 to the flared outlet end I0. Thus the passage 4 in the venturi trate the progressive increase in cross-sectional A`varea in the venturi, Fig. 3 showing the crosssectional area: of'the venturi 3 at the throat 8 and Fig. 4 indicating the increased area 'of the venturi at the outlet end Il). This increase in cross-sectional area from the throat 8 to a point vabout three inches from it is preferably notv greater than 50% and in the 4burner illustrated the outlet end I 0 has an area only about 20% greater than the cross-sectional area 'of 'the throat.'

'I'his gradual increase in cross-sectional area in the venturi is lpreferably obtained by directing .the lower portion of the venturi downwardly from the horizontal in its extent between the throat 8 and the'outlet end I0. The emciency ofthe mixing of the fuel with air is increased bythis manner of construction over a construction strictly horizontal or upwardly inclined. The downward slope of the venturi directs the fuel forwardly to thereby prevent any escape oi' the gas in the fuel mixture throughthe openings I3 member. The internal channel 2 in the membera I gradually decreases in cross-sectional area in .its extent from the sldeoi' the burner where the gasv first enters, to the 'oppositeside l The `venturi 3 is a generally tubular sh'aped member of substantial length and has a bell-like inlet end l, a constricted throat portion 8, a neck portion 9 and a flared outlet end I0. The ilared outlet end I0 of the venturi is integrally cast with the ring member I, and the bailles II are vertically disposed adjacent the outlet endof.

' by which the primary air is supplied in the event that vthe gas tends to settle to the bottom of the venturi.

In the embodiment of the invention illustrated thenon-circular neck 9 graduates into the outlet end Ill. the latter being shaped in the form of a rectangle. Although a rectangular shape in the outlet end III is preferred, it is not necessary that the outlet end be rectangular as other elongated or irregular shapes may be e'ectively employed.

The outlet end should. have its major axis vertical and its minor axis horizontal and the length of the major axis should be at least one and onehalf times the minor axis.

' The bell-like inlet'end 1 is provided with an i opening I2 for connection to a suitable supplyof gas and alsol with the openings I3 to receive I'he particular shape ofthe venturi with the accompanied increase in-cross-sectional area. of

eddy currents that increase the uniformity of the' `gas and air mixture and prevent any formation of globules of the burner` .fuel with either a greater or less proportion of vair or gas than that of the normal flowing fuel. In a burner where butane gas is employed, the butane being heavier than the air withwhich it is mixed has a tendency to settle out instead of readily mixing with the air. The employment of the venturi described in a gas burner supplied with butane prevents the butane from settling in this manner.

` Through the openings I3 in 'the inlet end 'I of the venturi, the round constricted throat 8 siphons the primary air required to be mixed with the gas and directs the eddy currents of gas and 'air generated in the venturi toward the ring ofv the burner. This action of the throat 8 combines with the downward slope of the venturi, previ- .ously described, to prevent the fuel from flowing backwards toward the inlet end of the venturi. l In the operation of the burner described, gas'l is forced into the center opening I2 of the inlet end 'I of the venturi 3 by operation of a valve `not shown. As the gas reaches the throat 8, a

suitable supply of air is automatically siphoned through openings I3 provided in the inlet end l `by operation of the round constricted throat 8.'

As the mixture of gas and air flowing inthe venturi reaches the neck 9, eddy currents are produced as the non-circular cross-sectional-area lof the passage 4 in the neck 9 progressively increases in the travel of the gas mixture toward the outlet end II).

As the eddy currents of gas and air flowing in the passage 4 of the venturi 3 strikey the segment l disposed at the outlet end I of the venturi, the' fuel is deected laterally in opposite direc- Y tions in a uniform manner and ilows from theV "passage 4 into the connecting channel 2 of the burner ring member` I von either side. The flow'- 1ing fuel enters the channel 2 at the lowest point l 1in the burner and the lateral ring deectors or .baiiies II direct the iiow of the fuel around the 4 l burner so that the fuel will be equally distributed throughout.

The leilect of the present invention is to provide a gas-burner that produces and employs a 'of circular cross section, and the section of theA supply pipe.

well-mixed equally distributed fuel that is an improvement over burner fuels previously known.

Various embodiments of the invention -may be' employed within the scope of the accompanying claims:

I claimz` 1. In a gas burner, a Venturi supply tube having an inlet end with a constricted throat portion tube between the throat and burner being of gradually increasing cross-sectional area with the `upperwall extending substantially parallel to the Y horizontal axis of the tube and with the lower wall of the tube extending downwardly from the throat at a substantial an le to provide for the increase in cross-sectiona area, the width of said tube section being not greater than the diameter of the throat and the cross-sectional area at approximately three inches from thev throat being not more than one hundred fty percent'as great as that of the throat portion of the tube.

2. A gas burner comprising a'circular tubular ring member having jet means provided'in its upper surface for-the discharge of gas therefrom throughout substantially the entire circumference of the ring, a Venturi supply pipe extending radially to one side of the burner ring in a plane below the horizontal plane of the ring to discharge gas into the ring atA the bottom of the latter and in a direction laterally andupwardly from -said supply pipe, a portion of the the level of said supply pipe immediately above the same to direct the gas laterally to opposite sides of the pipe and being imperforate to elimlnate ame propagation immediately above the THEODORE H. THIELE. 

